I disagree with what you mentioned regarding Leverkusen because the two teams are six points different, and Leverkusen still has the opportunity to close the gap with the games left in the season. I also assumed that Bayern had already won the Bundesliga title this season but since they drew their last match against Union Berlin, Leverkusen might win this trophy again this season.
However, the Champions League is not the only big challenge for Bayern Munich this season, as they failed to maintain their winning way against a team in the middle of the league. Bayern Munich needs to perform at their highest level in the last few matches of the season because if they continue with a draw or lose, Leverkusen might surpass them in the league table. After all, Xabi Alonso's team has no other competition this season apart from the Bundesliga.
Stopping too early is not a good idea, especially when you have a rival like Bayer behind you, when they proved last season that they can show very good winning streaks. On the one hand, 6 points is a pretty solid difference, which could be enough for Bayern to regain the title, but on the other hand, if they decide that they won too early, they could allow a situation in which they let Bayer get too close, and the end of the season could become nervous.